<template>
    <view v-if="goods_info.goods_name">
        <!-- 轮播图-->
        <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true">
            <swiper-item v-for="(item, i) in goods_info.pics" :key="i">
                <image :src="item.pics_big" @click="preview(i)"></image>
            </swiper-item>
        </swiper>
        <!-- 信息区域-->
        <view class="goods-info-box">
            <!-- 价钱-->
            <view class="price">{{goods_info.goods_price}} 元</view>
            <!-- 主体-->
            <view class="goods-info-body">
                <!-- 名称-->
                <view class="goods-name">{{goods_info.goods_name}}</view>
                <!-- 收藏-->
                <view class="favi">
                    <uni-icons type="star" size="18" color="gray"></uni-icons>
                    <text>收藏</text>
                </view>
            </view>
            <!-- 运费-->
            <view class="yf">快递: 免运费 -- {{cart.length}}</view>
        </view>
        <!-- 详细内容信息-->
        <rich-text :nodes="goods_info.goods_introduce"></rich-text>
        <!-- 商品导航组件-->
        <view class="goods_nav">
            <!-- api: https://uniapp.dcloud.io/component/uniui/uni-goods-nav.html
            属性说明
                options: 左侧按钮配置项
                buttonGroup: 右侧按钮配置项
                @click: 左侧按钮点击触发函数
                @buttonClick: 右侧按钮点击触发函数
            -->
            <uni-goods-nav :options="options" :buttonGroup="buttonGroup" @click="onClick" @buttonClick="buttonClick" />
        </view>
    </view>
</template>

<script>
    import {
        mapState,
        mapMutations,
        mapGetters
    } from 'vuex';

    export default {
        // 调用 mapState方法 , 把 m_cart模块 cart数组映射到页面中 , 作为计算属性使用
        // ...mapState('模块名称',['映射数据名称1' ,'映射数据名称2'])
        computed: {
            ...mapState('m_cart', ['cart']),
            ...mapGetters('m_cart', ['total'])
        },
        data() {
            return {
                goods_info: {},
                // 左侧栏配置
                options: [{
                    icon: 'shop',
                    text: '铺店'
                }, {
                    icon: 'cart',
                    text: '购物车',
                    // 徽标
                    info: 0
                }],
                // 右侧栏配置
                buttonGroup: [{
                    text: '加入购物车',
                    backgroundColor: '#ff0000',
                    color: '#fff'
                }, {
                    text: '立即购买',
                    backgroundColor: '#ffa200',
                    color: '#fff'
                }]
            };
        },
        methods: {
            ...mapMutations('m_cart', ['addToCart']),
            async getGoodsDetail(goods_id) {
                const {
                    data: res
                } = await uni.$http.get('/api/public/v1/goods/detail', {
                    goods_id
                })
                if (res.meta.status !== 200) return uni.$showMsg()

                // 为图片 img标签 添加样式 , 解决图片间隙问题 
                // 正则替换解释 : (正则后缀 全局g标志)
                //  1. '<img' => '<img style="display:block;" ' 
                //  2. '.webp' => '.jpg'
                res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g,
                    '<img style="display:block;" ').replace(/.webp/g, '.jpg')

                this.goods_info = res.message
            },
            // 实现轮播图效果
            preview(i) {
                // previewImage() 预览图片模式
                // current 图片索引 & 所有图片url地址数组
                uni.previewImage({
                    current: i,
                    urls: this.goods_info.pics.map(x => x.pics_big)
                })
            },
            onClick(e) {
                if (e.content.text === '购物车')
                    uni.switchTab({
                        url: '/pages/cart/cart'
                    })
                if (e.content.text === '铺店')
                    console.log("点击了铺店");
            },
            buttonClick(e) {

                if (e.content.text === '加入购物车') {
                    // 指定信息添加至购物车
                    this.addToCart({
                        goods_id: this.goods_info.goods_id,
                        goods_name: this.goods_info.goods_name,
                        goods_price: this.goods_info.goods_price,
                        goods_count: 1,
                        goods_small_logo: this.goods_info.goods_small_logo,
                        goods_state: true
                    })
                }

            }
        },
        onLoad(options) {
            const goods_id = options.goods_id
            this.getGoodsDetail(goods_id)
        },
        watch: {
            // 监听 购物车 总量徽章变化
            total:{
                handler(newVal){
                    // 查找购物车对象并且赋予数值
                    const findObj = this.options.find((e) => e.text === '购物车')
                    if (findObj) findObj.info = newVal
                },
                // immediate属性 声明侦听器是否在页面初次加载完毕后立即调用
                immediate: true
            }
        }
    }
</script>

<style lang="scss">
    swiper {
        height: 750rpx;

        swiper-item,
        image {
            width: 100%;
            height: 100%;
        }
    }

    .goods-info-box {
        padding: 10px;
        padding-right: 0;

        .price {
            color: #d81e06;
            font-size: 18px;
            margin: 10px 0;
        }

        .goods-info-body {
            display: flex;
            justify-content: space-between;

            .goods-name {
                font-size: 13px;
                padding-right: 10px;
            }

            .favi {
                width: 100px;
                font-size: 11px;
                display: flex;
                flex-direction: column;
                justify-content: center;
                align-items: center;
                border-left: 1px solid #efefef;
                color: gray;
            }
        }

        .yf {
            margin: 10px 0;
            font-size: 12px;
            color: gray;
        }
    }

    .goods-detail-container {
        // 给页面外层的容器，添加 50px 的内padding，
        // 防止页面内容被底部的商品导航组件遮盖
        padding-bottom: 50px;
    }

    .goods_nav {
        // 为商品导航组件添加固定定位
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
    }
</style>
